I annotated my lyrics for Incandescent in the SF lyric thread using the GENIUS Chrome extension, which rocks all sorts of everything everywhere. I thought it would be really fun to see inside peoples' lyrics. Except mine, which this week offer nothing necessarily trancidental. Just install http://genius.com/web-annotator then highlight some text and ad an annotation. It's very cool.

I'm also not a fan of an annotations thing that requires a certain way of listening to music, especially when id3v2 already has comments, lyrics, and time-synchronized lyrics as things. There's also Apple's podcast extensions which can be used to embed images at certain points in an audio file although I don't think those are very universally supported.